After menopause, it is common to see small benign ovarian cysts
. They are not related to ovulation and menstrual cycle as you are past that stage in your life.
Some cysts may be related to a malignancy. The decision to remove the cyst and or ovary will depend on the particular person , the size of the cyst, whether it is changing, family history, symptoms, and so on.
It is perfectly reasonable to remove this cyst at your age.